Do you have an idea how popular the iPhone is now? If not, check out the Camera Finder page on Flickr. Currently the iPhone is in the same pack as the Canon Digital Rebel XTi, the most popular camera on Flickr. Engadget nailed the reasons for iPhone’s popularity: it is always with the user, geo-tagging out of the box, always on wireless connection, etc. We can also consider the very enthusiastic iPhone application developer community an extra factor that boosts the iPhone over to the top.

One particular iPhone (works on iPod Touch too!) application I’d like to introduce today is PhotoScatter, developed by Unique Apps. PhotoScatter allows users to simply take or choose a photo from iPhone or iPod Touch, and submit it to top photo sharing sites on the Internet with touch of a button.

The current version (V1.0) supports Facebook, Flickr, Photobucket, Shutterfly, Picasa, and Twitter (TwitPic). The developer has promised to support more sites with upcoming versions.

If you’d like to see how it works, here’s a video of it in action:

It’s a pretty neat app that I think iPhone users might enjoy. The application was just recently released (August 10, 2009) and it already received mostly positive ratings on iTune Store.

Since the application is so new, the developer is currently running a 50% off promotion. Buyers will also receive future software updates free even after the current promotion period ends.